You know what makes me really really angry? When someone tells a mentally ill person to "suck it up", often followed by "other people have it worse than you" or "and deal with it".
First off, I don't care if other people have it worse than me. Newsflash, people dying of starvation do not make my MI magically go away. And thinking about them doesn't make me feel better. In fact, it makes me feel worse, both by reminding me of how crap this world is, and then by reminding me how crap I am for feeling the way I feel.
And second, I can't just deal with it, or suck it up. If I could deal with it the same way a non-mentally ill and/or neurotypical person could, I wouldn't have gotten this nice little certificate that says "bipolar II for life" on it. Me not being able to deal is the fucking definition of mental illness. So telling me to just deal with it is like telling a beached fish to just breathe.
So the next time you want to say this to a person with a mental illness, or even a person you don't know well enough to know if they have one or not - just don't. Doing so would turn you into an abelist asshat, and you know what, that's something you can actually do something about! So take your own advice and suck it up.